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https://issues.apache.org/jira/browse/SOLR-7836?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14698671#comment-14698671
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Yonik Seeley commented on SOLR-7836:
------------------------------------
OK, I let the current unmodified trunk run overnight.
I got 14 fails, 4 of which were deadlocks.
Here's the only changes I made to the test:
{code}
Index: solr/core/src/test/org/apache/solr/search/TestReloadDeadlock.java
===================================================================
--- solr/core/src/test/org/apache/solr/search/TestReloadDeadlock.java
(revision 1695727)
+++ solr/core/src/test/org/apache/solr/search/TestReloadDeadlock.java
(working copy)
@@ -74,7 +74,7 @@
int nWriteThreads = 5 + random().nextInt(10);
// query variables
- final AtomicLong reloads = new AtomicLong(50); // number of reloads.
Increase this number to force failure.
+ final AtomicLong reloads = new AtomicLong(200); // number of reloads.
Increase this number to force failure.
ifVerbose("commitPercent", commitPercent, "deleteByQueryPercent",
deleteByQueryPercent
, "ndocs", ndocs, "nWriteThreads", nWriteThreads, "reloads", reloads);
@@ -177,7 +177,7 @@
// The reload operation really doesn't need to happen from multiple
threads, we just want it firing pretty often.
while (reloads.get() > 0) {
- Thread.sleep(10 + random().nextInt(250));
+ Thread.sleep(1 + random().nextInt(50));
reloads.decrementAndGet();
h.getCoreContainer().reload("collection1");
}
{code}
> Possible deadlock when closing refcounted index writers.
> --------------------------------------------------------
>
> Key: SOLR-7836
> URL: https://issues.apache.org/jira/browse/SOLR-7836
> Project: Solr
> Issue Type: Bug
> Reporter: Erick Erickson
> Assignee: Erick Erickson
> Fix For: Trunk, 5.4
>
> Attachments: SOLR-7836-synch.patch, SOLR-7836.patch, SOLR-7836.patch,
> SOLR-7836.patch, deadlock_3.res.zip, deadlock_5_pass_iw.res.zip, deadlock_test
>
>
> Preliminary patch for what looks like a possible race condition between
> writerFree and pauseWriter in DefaultSorlCoreState.
> Looking for comments and/or why I'm completely missing the boat.
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